Pokémon Mansion, Route 10, Route 11, Route 16, Route 17, Route 18, Route 9, Sea Route 21 — 8 locations on the interactive map.
Burned Tower, Mt. Mortar, Route 1, Route 10, Route 11, Route 26, Route 27, Route 3, Route 38, Route 39, Route 4, Route 42 and 7 more — 19 locations on the interactive map.
Rattata → Raticate (Level 20)